Tap structure



J. S. BART EK Sept. 21, 1937.

TAP STRUCTURE 7 Filed July so, 1956 FIG. 3

FIG.4.

I N VE N TOR. John S. Bartelr ATTORNEY.

Patented Sept. 21, 1937 PATENT OFFICE.

2,093,507 TAP STRUCTURE John S. Bartek; Rochester, N. Y., assignor to Consolidated Machine Tool Corporation, Rochester, N. Y., a corporation of Delaware Application'July 30, 1936, Serial No. 93,440

i 5 Claims.

My invention relates to a tap structure of the type in which the chasers are automatically retracted at the end of a threadingoperation, and has for its objectto afford an improved simple 5 and practical arrangement for adjusting the parts, tovary the position of the chasers when in operative position, in accord with the diameter of the work. i l

A further purpose of the invention is to provide an economical construction in which an adjustable locking means is provided for holding the chasers in variable position when in operative relation, inconjunction with a removable nose or frame attachable to the body of the tap and car- 15 rying the chaser assembly, whereby different chaser assemblies may be employedon the same Another object of the inventionis to; afford an adjustable locking assembly that is located in one side of the body of the tap so that the looking membercan cooperate with the actuating block by a lateral movement without interfering with the connection between the actuating block and the chaser assembly, thus contributing to produce a more simple and efficient design.

. To these'and otherends, the invention consists in the construction and combination of parts that will appear clearly from the following description when read in conjunction with the accompanying drawing, the novel features being pointed out in the claims following the specification.

,q, In-the drawing:

Fig. 1 is-a longitudinal central sectional view of a tap, showing one embodiment of the invention, with, the chasersin operative position; a

Fig. 2 is a transverse sectional'view on 22 of Fig. 1;

Fig. 3 is a plan view of the locking member and its; housing removed from the body, and Fig. 4 is a sectional view of the sleeve and adjustably connected trip plate.

Referring more particularly to the drawing, in which like reference charactersrefer to the same parts throughout the several views, I designates the body of the tap having a central longitudinal opening within which is. slidably mounted an actuating block 2 to which is connected a rod 3 extending into a chamber in the extension 4 of the body. The rod 3 has a head 5 against which seats a spring 6 that controls the actuating block and moves the latter to withdrawthe chasers the line from engagement with the work to inoperative position when the threading operation is completed.

The chasers are designated at I, and are mounted for lateral movement in a nose or frame 8 which is removably attached to the body by the bolts 9, the chasers being moved laterally by cam members I operatively connected thereto and carried by a post H which is removably associated with the actuating block 2.

Slidably mounted on the body I is a sleeve l2 to which are adjustably connected the arms I3, while I4 is the trip plate attached to the outer 10 end of said arms 13 and operating, when engaged by the work or by a stationary part at the completion of the threading operation, to. force the sleeve I2 endwise on the body and effect release of the chasers in the manner that will ap- -15 pear presently. I5 is a hand lever pivoted at. 5 to ,thebody l and having its. inner end engageable with a. pin ll extending laterally and carried by the sleeve 12. The inner end of the hand lever 15, and the pin ll, extend through an open ing in the actuating block 2, and the hand lever I5 is operable to move the actuating block 2 and l the chasers to operative position, preparatory to the threading operation.

In order to lock the actuating .block 2 and chasers in operative position, a recess is provided in the body at one side of the central opening, and in said recess is adjustably mounted a housing Hi. In said housing I8 is pivoteda cam lever 19 having a nose 20 which engages a locking member or block 2| that is slidable laterally in said housing l8 and adapted to engage a shoulder on the actuating block 2. 22 is a spring seated in a recess in the cam lever l9 and engaging against a surface of thebody, to hold the cam lever and the locking member normally in locking position, as shown in Fig. 1. The cam lever l9 has a cam surface 23 which extends into an opening 23 of the sleeve l2. When the sleeve [2 is moved endwise, by engagement of the tripplate at the end of the threading operation, it moves the cam 23 of the cam lever inwardly and the nose 20 outwardly, thereby withdrawing the locking member 2| from engagement with the actuating block 2 and releasing the same, whichti15 is thereupon retracted by the spring 6, and the chasers thus move inwardly away from the work. It is desirable to provide means for adjusting the operative position of the chasers, and this is accomplished by varying the position of the locking member 2| endwise of the body. To accomplish this, the housing l8 has a threaded opening which is engaged by a threaded adjusting screw 24 which extends through an opening in the body and has a head 25 abutting against the body. 55

By turning the adjusting screw 24, the housing i8 can be moved endwise of the body, and in this fashion the endwise location of the locking member 2| can be adjusted, to determine the extent of outward movement of the chasers.

In order to hold the adjusting screw 24 in its adjusted position, and prevent accidental displacement, the head 25 is provided with serrations around the side thereof, and a spring-controlled plunger 26 is mounted in an opening in the body and movable transversely thereof to engage said serrations on the side of the head, as shown in Fig. 2. For the purpose of permitting access to the adjusting screw 24 to change the position of the locking member, an opening 27 is provided in the nose or frame 8, through which a screw driver can be inserted to turn the adjusting screw against the resistance of the spring-actuated friction locking plunger 26.

The parts are shown in operative position in Fig. 1, having been restored to this position by manual operation of the lever [B and retained by the locking member 2!. After the threading operation is completed, the trip plate I 4 is engaged as usual in this type of mechanism, causing an endwise movement of the sleeve l2 which thereupon engages and rocks the cam lever l9 and moves the locking member 2| outwardly to release the actuating block 2. The latter is retracted by the spring 6, causing corresponding endwise movement of the post H and thus retracting the chasers. The parts are restored to operative position by manipulating the hand lever l5, as already described.

While the invention has been set forth with reference to a particular construction, it is not confined to the details herein shown, and this application is intended to cover such modifications or changes as may come within the purposes of the improvement or the scope of the following claims.

I claim:

1. In a tap structure, the combination with a body having a central longitudinal opening, of a spring-controlled actuating block movable endwise of the body in said opening, chasers operatively connected to the actuating block, a lever pivoted to the body for operating said actuating block, the body having a recess at one 0 side of said central opening, a housing located in said recess, a locking member supported in said housing and movable laterally of the body into engagement with the actuating block, a cam lever pivoted in said housing and connected to 55 said locking member, and means for adjusting cam lever.

ing and movable laterally of the body into engagement with the actuating block, a cam lever pivoted in said housing and connected to said locking member, an adjusting member supported by the body and. having threaded engagement with said housing, a head on said adjusting member having serrations on its side, and a springactuated plunger movable laterally in the body and engaging said serrations on the head.

3. In a tap structure, the combination with a body having a central longitudinal opening, of a spring-controlled actuating block movable endwise of the body in said opening, chasers operatively connected to the actuating block, a lever pivoted to the body for operating said actuating block, the body having a recess at one side of said central opening, a housing located in said recess, a locking member supported in said housing and movable laterally of the body into engagement with the actuating block, a cam lever pivoted in said housing and connected to said locking member, an adjusting member supported by the body and having threaded engagement with said housing, a head on said adjusting member having serrations on its side, a spring-actuated plunger movable laterally in the body and engaging said serrations on the head, and a chaser-supporting nose removably attached to the body, said nose having an opening permitting access to said adjusting member.

l. In a tap structure, the combination with a body having a central longitudinal opening, of a spring-controlled actuating block movable endwise of the body in said opening, chasers operatively connected to the actuating block, a lever pivoted to the body for operating said actuating block, the body having a recess at one side of said central opening, a housing located in said recess, a locking member supported in said housing and movable laterally of the body into engagement with the actuating block, operating means in said housing connected to said locking member, means for adjusting the housing endwise in said recess, and a sleeve slidable on the body and controlling said operating means in the housing.

5. In a tap structure, the combination with a body having a central longitudinal opening, of a spring-controlled actuating block movable endwise of the body in said opening, chasers operatively connected to the actuating block, a lever pivoted to the body for operating said actuating block, the body having a recess at one side of said central opening, a housing located in said recess, a locking member supported in said housing and movable laterally of the body into engagement with the actuating block, a cam lever pivoted in said housing and having one end connected to said locking member, a spring located between the other end of said cam lever and the wall of said recess in the body, means for adjusting the housing in said recess, and a sleeve slidable on the body and cooperating with the outer end of said JOHN S. BARTEK. 

